Dispersion-engineered $χ^{(2)}$ nanophotonics: a flexible tool for nonclassical light

Abstract

This article reviews recent progress in quasi-phasematched χ (2) nonlinear nanophotonics, with a particular focus on dispersion-engineered nonlinear interactions. Throughout this article, we establish design rules for the bandwidth and interaction lengths of various nonlinear processes, and provide examples for how these processes can be engineered in nanophotonic devices. In particular, we apply these rules towards the design of sources of non-classical light and show that dispersion-engineered devices can outperform their conventional counterparts. Examples include ultrabroadband optical parametric amplification as a resource for measurement-based quantum computation, dispersion-engineered spontaneous parametric downconversion as a source of separable biphotons, and synchronously pumped nonlinear resonators as a potential route towards single-photon nonlinearities.

All-optical Quantum State Engineering for Rotation-symmetric Bosonic States

“…In addition to a strong second-order nonlinear interaction, LN has large electro-optic coefficients and ultra-low loss propagation of α = 3 dB/m, which allows for efficient and scalable linear optics implementations within the same chip [88,89]. Considering the measured nonlinear efficiency and propagation loss in thin-film LN platform, on-chip squeezing levels of > 15 dB are within the reach of current experimental capabilities [90,91]. On the measurement side, significant progress has been made both in developing low loss chip-to-fiber interconnects [92,93] and in monolithic integration of single-photon detectors on the LN thin-film [94][95][96].…”

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Supplementary document for Efficient simulation of ultrafast quantum nonlinear optics with matrix product states - 5352439.pdf

“…Regarding χ (2) nonlinear waveguides, thin-film periodically poled lithium niobate (PPLN) waveguides operated in the short wavelength regime λ a = 780 nm have been theoretically predicted to achieve η = 140 000 %W −1 cm −2 [7]. These numbers lead to L χ (2) = 2.7 cm for |k a | = 1 fs 2 mm −1 , making fabrication of nonlinear straight waveguides with single-photon-level nonlinearity plausible.…”